Top 150+ Solved Thermal Engineering 1 MCQ Questions Answer
Q. Axial flow compressor has the following advantage over centrifugal compressor
a. larger air handling ability per unit frontal area
b. higher pressure ratio per stage
c. aerofoil blades are used
d. higher average velocities
Q. Rotary compressors are suitable for
a. large discharge at high pressure
b. low discharge at high pressure
c. large discharge at low pressure
d. low discharge at low pressure
Q. The vloumetric efficiency of compressor with increase in compression ratio will
a. increase
b. decrease
c. remain same
d. may increase/decrease depending on clearance volume
Q. Thermal conductivity of solid metals with rise in temperature normally
a. increases
b. decreases
c. remains constant
d. may increase or decrease depending on temperature
Q. Heat transfer takes place as per -
a. zeroth law of thermodynamics
b. first law of thermodynamic
c. second law of the thermodynamics
d. Kirchhoff law (e) Stefan's law.
Q. When heat is transferred from one particle of hot body to another by actual motion of the heated particles, it is referred toas heat transfer by
a. conduction
b. convection
c. radiation
d. conduction and convection
Q. When heat is transferred from hot body to cold body, in a straight line, without affecting the intervening medium, it isreferred as heat transfer by
a. conduction
b. convection
c. radiation
d. conduction and convection
Q. The insulation ability of an insulator with the presence of moisture would
a. increase
b. decrease
c. remain unaffected
d. may increase/decrease depending on temperature and thickness of insulation
Q. When heat is Transferred by molecular collision, it is referred to as heat transfer by
a. conduction
b. convection
c. radiation
d. convection and radiation.
Q. Heat transfer in liquid and gases takes place by
a. conduction
b. convection
c. radiation
d. conduction and convection
Q. Which of the following is the case of heat transfer by radiation
a. blast furnace
b. heating of building
c. cooling of parts in furnace
d. all of the above.
Q. Metals are good conductors of heat because
a. their atoms collide frequently
b. thier atoms-are relatively far apart
c. they contain free electrons
d. they have high density
Q. Thermal conductivity of air with rise in temperature
a. increases
b. decreases
c. remains constant
d. may increase or decrease depending on temperature